Trump and his campaign were a frequent topic on CNN on Tuesday morning. From 6 a.m. to 10 a.m., the network broadcast clips of Trump’s interview Monday with Wisconsin radio host Charlie Sykes, a self-proclaimed "#NeverTrump guy," at least once every hour. Trump national spokeswoman Katrina Pierson and Trump supporter Terra Grant also made appearances on CNN in the morning hours.

In that same time span, former Wisconsin Gov. Tommy Thompson, who supports Kasich, was on the air, and supporters for Cruz and Marco Rubio, who suspended his campaign earlier this month, appeared on a panel discussion with Grant.

Pierson's appearance led to a heated exchange on air, with CNN host Don Lemon challenging Pierson as she defended the real-estate mogul’s controversial retweet of a side-by-side image of an unflattering shot of Heidi Cruz and a glamorous shot of Melania Trump.

“No one has maligned Heidi Cruz. No one has attacked Heidi Cruz,” Pierson told Lemon. “Melania Trump has been attacked. Where has that headline been on CNN? I bet CNN viewers didn’t even know Melania Trump has been attacked for months by pro-Ted Cruz people.”

Lemon responded, insisting Pierson’s comments were “disingenuous.”

The New York billionaire has clashed with networks before. In January, Trump withdrew from a Fox News debate, in part because of his disapproval with Megyn Kelly moderating and also because of the network’s mocking response.

Trump also accused the Republican National Committee of treating him unfairly. “I have millions more votes/hundreds more dels than Cruz or Kasich, and yet am not being treated properly by the Republican Party or the RNC,” he tweeted.

The businessman signed a loyalty pledge to support the eventual nominee but has continually entertained the possibility of a third-party run.